Issues with IMAP authentication - doveadm auth test fails

[Xpedite]

SYSTEM INFORMATION
Operating system	Debian Linux 11
Webmin version	2.101
Usermin version	2.001
Virtualmin version	7.8.2
Authentic theme version	21.04

I’m having issues with connecting to mail from remote and webmail. Here’s some information that should give some context.
I feel like I have tried everything so any help would be highly appreciated!

Here’s a snippet from the dovecot-info.log :

Nov 15 23:26:01 auth: Debug: auth client connected (pid=0)
Nov 15 23:26:01 auth: Debug: client in: AUTH	1	PLAIN	service=doveadm	debug	resp=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx (previous base64 data may contain sensitive data)
Nov 15 23:26:01 auth: Debug: passwd(user@mydomain.com): Performing passdb lookup
Nov 15 23:26:01 auth-worker(780457): Debug: Loading modules from directory: /usr/lib/dovecot/modules/auth
Nov 15 23:26:01 auth-worker(780457): Debug: Module loaded: /usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): Server accepted connection (fd=13)
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): Sending version handshake
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: Handling PASSV request
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: passwd(user@mydomain.com): Performing passdb lookup
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: passwd(user@mydomain.com): lookup
Nov 15 23:26:01 auth-worker(780457): Info: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: passwd(user@mydomain.com): Password mismatch
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: passwd(user@mydomain.com): CRYPT(100%mypassword) != 'x'
Nov 15 23:26:01 auth: Debug: passwd(user@mydomain.com): Finished passdb lookup
Nov 15 23:26:01 auth: Debug: auth(user@mydomain.com): Auth request finished
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: passwd(user@mydomain.com): Finished passdb lookup
Nov 15 23:26:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): auth-worker<1>: Finished
Nov 15 23:26:03 auth: Debug: client passdb out: FAIL	1	user=user@mydomain.com
Nov 15 23:27:01 auth-worker(780457): Debug: conn unix:auth-worker (pid=772399,uid=111): Disconnected: Connection closed (fd=-1)

My dovecot configuration is below.
disclaimer: there might be some odd things here because of all the things I have tried. Please don’t judge me

# 2.3.13 (89f716dc2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.13 (cdd19fe3)
# OS: Linux 5.10.0-26-amd64 x86_64 Debian 11.8 
# Hostname: xxxxxx.contaboserver.net
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain cram-md5
auth_verbose = yes
disable_plaintext_auth = no
info_log_path = /var/log/dovecot-info.log
log_path = /var/log/dovecot.log
mail_debug = yes
mail_location = maildir:~/Maildir
mail_privileged_group = mail
namespace inbox {
  inbox = yes
  location = 
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  driver = passwd
}
protocols = imap pop3 pop3
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
}
service imap-login {
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
service submission-login {
  inet_listener submission {
    port = 587
  }
}
ssl_cert = </etc/ssl/virtualmin/xxxxxxxxxxxx/ssl.cert
ssl_cipher_list = ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
ssl_key = # hidden, use -P to show it
ssl_min_protocol = TLSv1.2
userdb {
  driver = passwd
}
local_name mydomain.com {
  ssl_cert = </etc/ssl/virtualmin/xxxxxxxxxxxx/ssl.combined
  ssl_key = # hidden, use -P to show it
}
local_name *.mydomain.com {
  ssl_cert = </etc/ssl/virtualmin/xxxxxxxxxxxx/ssl.combined
  ssl_key = # hidden, use -P to show it
}

Somehow there is an issue matching the passwords I think(?)
Anyone who can point me in the right direction ?

Alternatively, is there a way to reset all config files for postfix and dovecot back to original ?
I have been troubleshooting so much by now that I no longer have an idea what the originals were. ( In the mean time I have learned that it’s possible to make backups of config files )

[stefan1959]

What software are you using for webmail?

[Xpedite]

Sometimes a fresh start does wonders
I found the issue.

Somehow auth-deny.conf.ext had :

# Example deny passdb using passwd-file. You can use any passdb though.

passdb {
 driver = passwd-file
 deny = yes

# File contains a list of usernames, one per line
  args = /etc/dovecot/deny-users
}

the thing is that when I did dovecot -n it wasn’t clear that it was in the auth-deny

Sorry for bothering. I had spent countless hours looking for the issue so I was getting hopeless.
Although I have no clue how that issue happened it may still be useful for someone one day…